This library is an implementation of TLS streams using the most appropriate
system library by default for negotiating the connection. That is, on
Windows this library uses SChannel, on OSX it uses SecureTransport, and on
other platforms it uses OpenSSL.

Each TLS stream implements the Read and Write traits to interact and
interoperate with the rest of the futures I/O ecosystem. Client connections
initiated from this crate verify hostnames automatically and by default.

This crate primarily exports this ability through two extension traits,
TlsConnectorExt and TlsAcceptorExt. These traits augment the
functionality provided by the native-tls crate, on which this crate is
built. Configuration of TLS parameters is still primarily done through the
native-tls crate.